Milgrom C, Miligram M, Simkin A, Burr D, Ekenman I, Finestone A
Department of Orthopaedics, Hadassah University Hospital, Hebrew University Medical School, Ein Kerem, Jerusalem, Israel.
Am J Phys Med Rehabil. 2001 Jun;80(6):433-8. doi: 10.1097/00002060-200106000-00009.
To compare the strain and strain rates generated during lower limb calisthenics with walking, an exercise that has been found to have only minimal effect on bone mass. Strengthening of bone, while it still has adaptive ability, can be achieved by exercise. Mechanical loading during physical activity produces strains and strain rates within the bones. It is thought that strain and strain rates higher than the usual provide the stimulus for the bones' adaptation.
Three strain-gauged bone staples were inserted percutaneously in a 30 degrees rosette pattern in the medial aspect of the midtibial diaphysis of two volunteers. The principal compression, tension, shear strains, and strain rates were measured during various lower limb calisthenics and compared with those of jogging and walking.
Zig-zag hopping was in the grouping of exercises with the highest principal compression, tension, and shear strains and compression strain rates, whereas walking was in the lowest or next-to-the-lowest grouping for all principal strain or strain rates.
Zig-zag hopping, based on the high strain and strain rates that it produces, may be an optimal tibial bone-strengthening exercise.
比较下肢健身操与步行过程中产生的应变和应变率，步行这种运动已被发现对骨量仅有极小的影响。在骨骼仍具有适应能力时，可通过运动实现骨骼强化。身体活动期间的机械负荷会在骨骼内产生应变和应变率。据认为，高于平常的应变和应变率为骨骼适应提供了刺激。
在两名志愿者胫骨骨干中部内侧，以30度玫瑰花结模式经皮插入三个应变片式骨钉。在各种下肢健身操过程中测量主压缩、拉伸、剪切应变及应变率，并与慢跑和步行时的情况进行比较。
之字形单脚跳属于主压缩、拉伸和剪切应变以及压缩应变率最高的运动分组，而步行在所有主应变或应变率方面处于最低或次低分组。
基于其所产生的高应变和应变率，之字形单脚跳可能是一种优化的胫骨强化运动。
